Sightmark now has a Slide-to-Side mount on its magnifiers, allowing the ability to quickly move the magnifier out of the way without having to detach the unit.
Sightmark Tactical Magnifiers are designed for use with holographic, collimator reflex and other compatible weapons sights, giving the shooter the benefits of both a reflex sight and a scope.
The magnifier can be mounted on most Picatinny and Weaver mounts and features a lightweight, waterproof, fog proof and shatter-proof frame, which provides durability in all elements. For more information, go to Sightmark.com.
Don't buy Sightmark, I learned the hard way. You can't cut coners on these things.